add wasirun variable to Makefile

Signed-off-by: Achille Roussel <[email protected]>

Author: achille-roussel

Makefile

@@ -1,14 +1,15 @@
 .PHONY: test lint wasirun
 
 GOPATH ?= $(shell $(GO) env GOPATH)
+wasirun = $(GOPATH)/bin/wasirun
 
 wasip1.test: go.mod $(wildcard wasip1/*.go)
 	GOARCH=wasm GOOS=wasip1 $(GO) test -c ./wasip1
 
 test: wasirun wasip1.test
-	wasirun wasip1.test -test.v
+	$(wasirun) wasip1.test -test.v
 
-wasirun: $(GOPATH)/bin/wasirun
+wasirun: $(wasirun)
 
-$(GOPATH)/bin/wasirun:
+$(wasirun):
 	$(GO) install github.com/stealthrocket/wasi-go/cmd/wasirun@latest